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The ornamental design for a vertical droplet model, as shown and described. |
FIG. 1 is a top plan view of a vertical droplet model showing our new design.
FIG. 2 is a bottom plan view thereof.
FIG. 3 is a left side elevational view;
FIG. 4 is a right side elevational view;
FIG. 5 is a seond left side elevational view;
FIG. 6 is a bottom perspective view; and,
FIG. 7 is a top perspective view of FIG. 1.
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